• Dec , 07 2023

1. Inspection and cleaning: Remove all foreign impurities and debris from the gasket compression surface, various fasteners (bolts, double headed bolts), nuts, and gaskets; Check for burrs, cracks, and other defects on fasteners, nuts, and washers; Check the flange surface for any warping or deformation, radial scratches, deep tool impact marks, or other defects that affect the correct seating of ...

• Dec , 07 2023

The installation of safety valves should meet the following requirements (1) Boilers with a rated evaporation capacity greater than 0.5t/h shall be equipped with at least two safety valves; Boilers with a rated evaporation capacity of less than or equal to 0.5t/h shall be equipped with at least one safety valve. Safety valves must be installed at the outlet of the separable economizer and the outl...

• Dec , 12 2023

Adjustment of safety valve opening pressure (set pressure): Within the specified working pressure range, the opening pressure can be adjusted by rotating the adjusting screw and changing the pre tightening compression amount of the spring. After removing the valve cover and loosening the locking nut, the adjustment screw can be adjusted. Firstly, increase the inlet pressure to make the valve jump ...

• Dec , 14 2023

Ball valves have evolved from plug valves. It has the same 90 degree rotation lifting action, but the difference is that the plug body is a sphere with a circular through-hole or channel passing through its axis. The ratio between the sphere and the channel should be such that when the sphere rotates 90 degrees, it should all appear spherical at the inlet and outlet, thereby cutting off the flow. ...

• Dec , 19 2023

When carbon steel or stainless steel flanges are equipped with 304 material bolts in flange joint sealing, leakage problems often occur during operation. This lecture will provide a qualitative analysis of this. (1) What are the basic differences between 304, 304L, 316, and 316L materials? 304, 304L, 316, and 316L are commonly used stainless steel materials in flange joints (including flanges, sea...

• Dec , 19 2023

Globe valves are used to cut off the flow of media, and are suitable for situations that require frequent opening. The sealing parts of a globe valve are the valve disc and valve seat. In order to ensure a tight closing of the globe valve, the mating surface of the valve disc and valve seat should be ground or a gasket should be used. The sealing surface can also be embedded with corrosion-resista...

• Dec , 21 2023

WCB Carbon steel ASTM A216 Non corrosive applications, including water, oil, and gas, Temperature range: -30oC to+425oC LCB Low temperature carbon steel ASTM A352 Low temperature applications, with temperatures as low as -46oC Cannot be used in environments with temperatures above+340oC LC3 3.5% nickel steel ASTM A352 Low temperature applications, with temperatures as low as -101oC Cannot be used ...

• Dec , 28 2023

How to choose the model of valve electric actuator? When selecting a valve electric device, users should first understand the type of valve, the working specifications of the device, and the position of the valve on the pipeline or equipment. Then, they should inquire about the functional requirements of the electric head. Attention should be paid to determining the IP protection level of the elec...

• Dec , 28 2023

1、 Sealing performance: Check valves should have good sealing performance to prevent medium backflow. The sealing performance can be determined by observing whether there is water leakage after the valve is closed. 2、 Circulation capacity: A good check valve should have a large flow capacity, which can minimize flow resistance and pressure loss as much as possible. The flow capacity can be determi...